Poor pollination can lead to misshapen fruits due to the inadequate deposition of pollen by bees on all three lobes of the female flower stigma. This causes formation of misshapen fruits and seen on watermelon and cucumber.

Bee activity can be reduced due to a variety of aspects including weather conditions, and the presence of other preferential flowers in the area. However low bee activity doesn’t cause misshapen fruits, but the size is affected due to limited pollination.